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Date: Mon, 28 Apr 2003 10:24:21 -0700
From: Jun Sun <jsun@mvista.com>
To: Steven Seeger <sseeger@stellartec.com>
Cc: linux-mips@linux-mips.org, jsun@mvista.com
Subject: Re: wait on vr4181 part 2
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In-Reply-To: <089f01c30da9$e237d5d0$3501a8c0@wssseeger>; from sseeger@stellartec.com on Mon, Apr 28, 2003 at 10:16:18AM -0700
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On Mon, Apr 28, 2003 at 10:16:18AM -0700, Steven Seeger wrote:
> If there is no wait, then what's that in arch/mips/vr4181/osprey/reset.c ?

Simple - it is a bug. :)

I got a confirmation from NEC that Vr4181 does _not_ have wait instruction.
It should generate an exception though.

In the halt case, kernel is probably in such a zombie state that we
don't even see the exception.

Jun

> void nec_osprey_halt(void)
> {
> 	printk("KERN_NOTICE "\n** You can safely turn off the power.\n");
> 	while(1)
> 		__asm__(".set\tmips3\n\t"
> 			"wait\n\t"
> 			".set\tmips0");
> }
> 
> Steve
>